<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .div1 {
            background-color: red;
            width: 100px;
            height: 100px;
            border: 1px solid black;
            margin: 10px;
            padding: 10px;
            /* float: left; */

        }

        .div2 {
            background-color: blue;
        }

        .div3 {
            background-color: green;
        }
    </style>

</head>

<body>
    <div class="div1"> wawawawawa</div>
    <div class="div2"> wawawawawa</div>
    <div class="div3"> wawawawawa</div>
</body>

</html>